what rpms am i turning

Discussion in 'Technical' started by 72 maverick, Mar 17, 2007.

  1. 72 maverick

    72 maverick Member

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    1972 302 three speed manual with a 2.79 rear end. How fast is the motor turnin in third gear at like sixty? Or seventy? or fifty? Just currious since i have no tach..

    later!! chris
     
    72 maverick, Mar 17, 2007
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  2. 71gold

    71gold Frank Cooper Supporting Member

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    ...what size rear tires? (tall)

    ...:bouncy: ...
     
    71gold, Mar 17, 2007
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  3. 72 maverick

    72 maverick Member

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    14's 185-75 i think
     
    72 maverick, Mar 17, 2007
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  4. T.L.

    T.L. Banned

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    Probably 2500RPM at 65mph...
     
    T.L., Mar 18, 2007
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  5. baddad457

    baddad457 Member

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    2258 @ 60 mph. 185/75/14 is 25 inches tall. Multiply that times Pi (3.1416) to get circumference. Divide the circumference into 63,360 (inches in one mile) to get tire revolutions per mile. Multiply that times the gear ratio. This sum is what the revs are at 60 mph. For other speeds use this as a baseline.90 mph would be 2258 X 1.5----120 mph revs would be 2258 X 2.
     
    baddad457, Mar 18, 2007
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  6. MaverickGrabber

    MaverickGrabber MaverickGrabber1972

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    MaverickGrabber, Mar 18, 2007
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